﻿//        Copyright (c) 2009, Semyon A. Chertkov (semyonc@gmail.com)
//        All rights reserved.
//
//        Redistribution and use in source and binary forms, with or without
//        modification, are permitted provided that the following conditions are met:
//            * Redistributions of source code must retain the above copyright
//              notice, this list of conditions and the following disclaimer.
//            * Redistributions in binary form must reproduce the above copyright
//              notice, this list of conditions and the following disclaimer in the
//              documentation and/or other materials provided with the distribution.
//            * Neither the name of author nor the
//              names of its contributors may be used to endorse or promote products
//              derived from this software without specific prior written permission.
//
//        THIS SOFTWARE IS PROVIDED ''AS IS'' AND ANY
//        EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
//        WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
//        DISCLAIMED. IN NO EVENT SHALL  AUTHOR BE LIABLE FOR ANY
//        DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
//        (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
//        LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
//        ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
//        (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
//        SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

using System;
using System.Collections.Generic;
using System.Text;
using System.Reflection;
using System.Reflection.Emit;
using DataEngine.CoreServices.Generation;

namespace DataEngine.CoreServices
{
    public class MethodConverter: ValueConverter
    {
        private Dictionary<Type, MethodInfo> _methodInfo;

        public MethodConverter(Type[] source, Type dest, Type convertor, string name)
        {
            Source = source;
            Destination = dest;
            _methodInfo = new Dictionary<Type, MethodInfo>();
            MethodInfo[] methods = convertor.GetMethods(BindingFlags.Static | BindingFlags.Public);
            foreach(MethodInfo method in methods)
                if (method.Name == name && method.ReturnType == dest)
                {
                    ParameterInfo[] pi = method.GetParameters();
                    foreach (Type src in source)
                        if (pi.Length == 1 && pi[0].ParameterType == src)
                        {
                            _methodInfo.Add(src, method);
                            break;
                        }
                }
            if (_methodInfo.Count != source.Length)
                throw new ArgumentException("Not all requested conversion supported by class", convertor.Name);
        }        

        public override void Compile(Executive engine, ILGen il, LocalAccess locals, Type sourceType)
        {
            il.EmitCall(_methodInfo[sourceType]);
        }
    }
}
